1 /*
2 * NUMA irq-desc migration code
3 *
4 * Migrate IRQ data structures (irq_desc, chip_data, etc.) over to
5 * the new "home node" of the IRQ.
6 */
7
8 #include <linux/irq.h>
9 #include <linux/module.h>
10 #include <linux/random.h>
11 #include <linux/interrupt.h>
12 #include <linux/kernel_stat.h>
13
14 #include "internals.h"
15
16 static void init_copy_kstat_irqs(struct irq_desc *old_desc,
17 struct irq_desc *desc,
18 int node, int nr)
19 {
20 init_kstat_irqs(desc, node, nr);
21
22 if (desc->kstat_irqs != old_desc->kstat_irqs)
23 memcpy(desc->kstat_irqs, old_desc->kstat_irqs,
24 nr * sizeof(*desc->kstat_irqs));
25 }
26
27 static void free_kstat_irqs(struct irq_desc *old_desc, struct irq_desc *desc)
28 {
29 if (old_desc->kstat_irqs == desc->kstat_irqs)
30 return;
31
32 kfree(old_desc->kstat_irqs);
33 old_desc->kstat_irqs = NULL;
34 }
35
36 static bool init_copy_one_irq_desc(int irq, struct irq_desc *old_desc,
37 struct irq_desc *desc, int node)
38 {
39 memcpy(desc, old_desc, sizeof(struct irq_desc));
40 if (!alloc_desc_masks(desc, node, false)) {
41 printk(KERN_ERR "irq %d: can not get new irq_desc cpumask "
42 "for migration.\n", irq);
43 return false;
44 }
45 spin_lock_init(&desc->lock);
46 desc->node = node;
47 lockdep_set_class(&desc->lock, &irq_desc_lock_class);
48 init_copy_kstat_irqs(old_desc, desc, node, nr_cpu_ids);
49 init_copy_desc_masks(old_desc, desc);
50 arch_init_copy_chip_data(old_desc, desc, node);
51 return true;
52 }
53
54 static void free_one_irq_desc(struct irq_desc *old_desc, struct irq_desc *desc)
55 {
56 free_kstat_irqs(old_desc, desc);
57 free_desc_masks(old_desc, desc);
58 arch_free_chip_data(old_desc, desc);
59 }
60
61 static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc,
62 int node)
63 {
64 struct irq_desc *desc;
65 unsigned int irq;
66 unsigned long flags;
67
68 irq = old_desc->irq;
69
70 spin_lock_irqsave(&sparse_irq_lock, flags);
71
72 /* We have to check it to avoid races with another CPU */
73 desc = irq_desc_ptrs[irq];
74
75 if (desc && old_desc != desc)
76 goto out_unlock;
77
78 desc = kzalloc_node(sizeof(*desc), GFP_ATOMIC, node);
79 if (!desc) {
80 printk(KERN_ERR "irq %d: can not get new irq_desc "
81 "for migration.\n", irq);
82 /* still use old one */
83 desc = old_desc;
84 goto out_unlock;
85 }
86 if (!init_copy_one_irq_desc(irq, old_desc, desc, node)) {
87 /* still use old one */
88 kfree(desc);
89 desc = old_desc;
90 goto out_unlock;
91 }
92
93 irq_desc_ptrs[irq] = desc;
94 spin_unlock_irqrestore(&sparse_irq_lock, flags);
95
96 /* free the old one */
97 free_one_irq_desc(old_desc, desc);
98 kfree(old_desc);
99
100 return desc;
101
102 out_unlock:
103 spin_unlock_irqrestore(&sparse_irq_lock, flags);
104
105 return desc;
106 }
107
108 struct irq_desc *move_irq_desc(struct irq_desc *desc, int node)
109 {
110 /* those static or target node is -1, do not move them */
111 if (desc->irq < NR_IRQS_LEGACY || node == -1)
112 return desc;
113
114 if (desc->node != node)
115 desc = __real_move_irq_desc(desc, node);
116
117 return desc;
118 }
119
120
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